An error related to aspnet_compiler.exe occured during update
check the installation logs %temp%\SetupLogXXXXXXXX.txt
2021-06-04 14:52:03.740 -- Operation --
2021-06-04 14:52:03.740 Name: PIOPrecompileIISAppForBib
2021-06-04 14:52:03.740 Executing: "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib
2021-06-04 15:00:15.567 Execution completed with return code: 1
2021-06-04 15:00:15.567 This is an error return code.
2021-06-04 15:00:15.567 Operation failed.
2021-06-04 15:00:15.567 [ERROR] Program "aspnet_compiler.exe" returned error code 1.
This error occur when you try to execute this command in a Command Prompt "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib
Setup could fails on update when a corrupted Call Analytics info file was created previously
<IUCS Root>\Apps\BillyBlues\Engine\Web\BINFO
Delete this folder and click on retry
<IUCS Root>\Apps\BillyBlues\Engine\Web\BINFO
In some cases, the same error could appears if Windows permissions are not enough to execute the installation correctly.
This error occur when you try to execute this command in a Command Prompt "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib
If it is the case, or, if you are not sure about execution permission level allowed, run the Installation package as "SYSTEM" user as reported here